Remove unused NeedsDeepCopy.

src/core/SkPaintPriv.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaintPriv.h"
 
 #include "SkBitmap.h"
@@ skipping 58 matching lines @@
                 SkColorFilter::kAlphaUnchanged_Flag) == 0)) {
                 break;
             }
             return true;
         default:
             break;
         }
     }
     return false;
 }
-
-bool NeedsDeepCopy(const SkPaint& paint) {
-    /*
-     *  The types below are not yet immutable/reentrant-safe, and so we return
-     *  true if instances of them are present in the paint.
-     *
-     *  Eventually we hope this list will be empty, and we can always return
-     *  false.
-     */
-    return paint.getImageFilter();
-}